Frigidity

It cannot be denied it [the chameleon] is (if not the moſt of any) a very abſtemious animall, and ſuch as by reaſon of its frigidity, paucity of bloud, and latitancy in the winter (about which time the obſervations are often made) will long ſubſist without a viſible ſuſtentation.

In France, Mme. de Pompadour was induced by Louis XV to eat such testicles in order to break down her frigidity.

An epileptic lover may (slightly) experience […] sporadic impotence/frigidity.